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Abstract

A device with negative dynamic conductance region can be used to convert voltage ramps into electrical current pulses. Fig. 1 illustrates this conversion process using an I-V curve. Tunnel diodes and resonant tunneling diodes are familiar examples that exhibit negative dynamic conductance.

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English (United States)

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Laser Diode Pulser Using Resonant Quantum Well Devices

A device with negative dynamic conductance region can be used to convert
voltage ramps into electrical current pulses. Fig. 1 illustrates this conversion
process using an I-V curve. Tunnel diodes and resonant tunneling diodes are
familiar examples that exhibit negative dynamic conductance.

By incorporating this circuit with a laser diode (Fig. 2), one can generate short
laser pulses. Recently, it has been shown that the resonant tunneling double-
barrier diode can modulate current up to several milliamperes (see, e.g., Fig. 4 of 1). This is sufficient to turn on low-threshold (N mA 2) laser diodes without the
DC bias circuitry shown in Fig. 2. Both laser diodes and resonant tunneling
diodes can be integrated on GaAs or InP substrates; thus a very compact laser
diode pulsing circuit can be achieved with this active source modulation
approach. Laser diodes and resonant tunneling diodes have been modulated up
to 46 GHz 3 and 56 GHz 1, respectively. It is not expected that the high speed
performance of non-integrated technology using, e.g., step recovery diodes as
pulsing source for laser diodes, can match that of integrated laser diodes with
resonant tunneling diodes.

It is difficult to generate voltage ramps at a multi-gigahertz frequency.
Sinusoidal waveforms could be used in place of the sawtooth waveforms. In this
case, only the positive portion of the sine wave generates laser light. (The
negative portion r...